Ian Sigalow

Co-Founder and Managing Partner at Greycroft

📍 New York, New York, United States🔄 Updated September 2026💼 46 investments📅 18 years investing🗓 Last invested Jul 2026𝕏 @upgrade_to_unlock
VC🌍 United States20+ investmentsInvested this quarter
46
Total investments
28
Early stage
12
Mid stage
1
Late stage
18y
Years active

Portfolio

45 investments · sorted by recency
All investments
Early stage
Mid stage
Late stage
Board Member
Mar 2025
The first Behavior Design Engine for the enterprise. Sequen isn’t retrofitted AI search or recommendations. It rethinks relevance from first principles. Sequen introduces the first foundational Large Event Model (LEM), trained on billions of user event sequences and built natively on a reinforcement learning infrastructure. LEMs are specialized neural networks that predict the next user event—just as LLMs predict the next word. Sequen’s LEMs are pre-trained on billions of user-site interactions and fine-tuned to optimize for the outcomes you care about. No more fixed pipelines with fragmented infrastructure. Sequen replaces them with a single endpoint that adaptively handles all phases of personalization via LEMs and memory models—all through a sub-25ms API.
Investor
Jul 2024
Hippocratic AI has developed a safety-focused Large Language Model (LLM) for healthcare. The company believes that a safe LLM can dramatically improve healthcare accessibility and health outcomes in the world by bringing deep healthcare expertise to every human. No other technology has the potential to have this level of global impact on health. The company was co-founded by CEO Munjal Shah, alongside a group of physicians, hospital administrators, healthcare professionals, and artificial intelligence researchers from El Camino Health, Johns Hopkins, Stanford, Microsoft, Google, and NVIDIA. Hippocratic AI has received a total of $278 million in funding and is backed by leading investors, including Andreessen Horowitz, General Catalyst, Kleiner Perkins, NVIDIA’s NVentures, Premji Invest, SV Angel, and six health systems. For more information on Hippocratic AI, www.HippocraticAI.com. Be aware of recruitment scams impersonating Hippocratic AI. All recruiting communication will come from @hippocraticai.com email addresses. We will never request payment or sensitive personal information. If anything appears suspicious, stop engaging immediately and report the incident.
Board Member
Dec 2023
Unfiltered access to what buyers are saying about you, your competitors, and your market.
Board Observer
Dec 2023
Newton, the newest member of your analytics team.
Board Member
May 2022
Hidden Road is the global credit network for institutions, enabling seamless access to traditional and digital markets. Conflict-free and built on a modern technology stack, we remove complexity and cost in prime brokerage, clearing and financing. For more information please email info@hiddenroad.com.
Board Member
Oct 2021
Finally, life insurance that makes sense. At Amplify, we believe that securing our future, protecting our families, and growing our wealth should be a transparent and inclusive opportunity – for everyone. Amplify is a democratizing access to life insurance policies previously used by the wealthiest 1%. These products protect your family, and you can access your funds while youre alive for retirement, college funding – whatever you wish. We help you customize a plan based on your needs and get pre-underwritten for the best rates, all in under 5 minutes. We have a team of live, licensed experts to help you at any time.
early stageInsurance
Board Member
Mar 2021
Stable is an industry risk club that helps supply chain professionals understand and manage volatile commodity prices. The club makes it easy to protect your balance sheet, save money and lower your tax bill.
Board Member
Dec 2020
We're building the future of pet health care. Members pet parents get 24/7 access to exceptional virtual veterinary care in less than 1 minute, with pet health & wellness products for their pets' health needs.
Board Member
Oct 2020
Toggle AI is your own financial analyst. Monitoring all market and fundamental data in real-time, it distills the observations into a cogent stream of timely investment insights. You can also test your intuition against the data, at the speed of thought. Tap into the power of Big Data and AI to answer a wide range of investment questions.
Board Member
Jul 2020
Ergatta is changing the motivation that moves people. We are a team of bright, driven, and innovative thinkers on a mission to build a new consumer category: game-based home fitness. Our flagship product, the Ergatta Rower, provides a competitive and personalized full-body rowing workout through an engaging game-based interface. Our products are sustainably-made in New England from American cherrywood and designed to be on display. As fitness activity increasingly shifts into the home, we believe the big winners will be those who innovate around what is on the screen. Our content provides a new and uniquely addictive consumer experience, radically different from traditional instructor-led offerings. Ergatta recently closed a $30M Series A, led by Advanced Venture Partners and joined by Greycroft, Fifth Wall, Gaingels, and Hans Tung (GCV). Off the heels of that capital raise, we are expanding our game studio, breaking into new verticals, and continuing to challenge the way at-home fitness “should” look and feel. However, above all else, we are investing in our company’s most important asset: our people. We’re proud to be a Great Place to Work-Certified™ company! For more information, please be sure to check out our GPTW Company Profile: https://www.greatplacetowork.com/certified-company/7038421
Board Member
May 2020
At Branch, we’re returning insurance to its original purpose as a force for communal good. Our expert team is on a mission to innovate an industry that’s lost its way. Home and auto insurance should be less expensive, easier to buy, and allow more people to get the coverage they need. So we’ve built the community-focused insurance we’ve always wanted, at the culture-first company we’ve always wanted to work for. B Corp Certified. Glassdoor’s Best Places to Work 2022 & 2023. The future of insurance is here.
mid stageInsurance
Board Member
Jan 2020
Landing is reinventing apartment rentals through a membership program that gives members access to flexible leases with no deposits in 200+ markets in our growing network. Our streamlined platform provides access to tens of thousands of furnished apartments across the U.S., and our member benefits allow more flexibility with fewer compromises. Members can book an apartment in minutes entirely through our app (even use a credit card) and be ready to move to a new place in a matter of days. Our goal is to help people explore more, live on their terms, and make sure they feel at home wherever they go.
Board Member
Jan 2020
ClosedLoop is healthcares data science platform. We make it easy for healthcare organizations to use AI to improve outcomes and reduce costs. Purpose-built for healthcare, ClosedLoop combines an intuitive end-to-end machine learning platform with a comprehensive library of healthcare-specific features and model templates. Customers use ClosedLoops Explainable AI to drive clinical excellence, operational efficiency, value-based contracts, and enhanced revenue. Example applications of our technology include: • Predicting admissions / readmissions • Predicting total utilization / total risk • Preventing ED over-utilization • Reducing out of network utilization • Avoiding appointment no-shows • Predicting chronic disease onset or progression • Improving clinical documentation and reimbursement … and dozens more ClosedLoop is proud to be the winner of the CMS AI Health Outcomes Challenge and was named Best in KLAS for Healthcare AI: Data Science Solutions in 2022 and 2023. Weve also been named a 2023 Top Startup to Work For by Built In. If you are interested in contacting our team, please email info@closedloop.ai
Board Member
Jun 2019
Mercato connects you to local specialty food shops. Order fresh local groceries online from the stores you love, and have them delivered to your door. You can select from individual items and curated lists and order all of the ingredients to a recipe with one click. Learn more about us at www.mercato.com.
Board Member
Apr 2019
Kangaroo puts smart home security within everyone's reach with simple, affordable, and secure solutions that can be set-up in minutes.
mid stageInsurance
Show all 45 investments ↓
Experience · 49 entries
All (49)
Investments (46)
Founder (2)
Board (41)
2026
Board Observer
Jul 2026
Palmetto is a leading clean tech company on a mission to accelerate the transition to a clean energy future. With the belief that consumers can have it all, we are an uncompromising energy company that makes going green a no-brainer. Our award-winning platform empowers homeowners, businesses, and entrepreneurs to adopt renewable energy through simple, scalable, and innovative solutions. We operate at the intersection of B2B and D2C, offering software, financial tools, and services that drive real environmental impact—without compromising value. Our Clean Energy Platform makes solar and home electrification easy to access, easy to afford, and easy to manage. The Palmetto journey: • Download our app • Switch to clean energy products including solar, HVAC, and energy storage • Finance with flexible options • See your savings in real time with energy insights We deliver flexible energy plans, real-time insights, and seamless customer experiences through offerings like our Consumer App and Marketplace, LightReach™ Solar and HVAC Subscriptions, and Asset Management tools—with more innovations on the way. How We Think We’ve always been told a cleaner future means sacrifice. Turn it down, pay more, wait forever. We don’t buy that. At Palmetto, we believe the future is abundant. We help homeowners have it all: lower energy bills, smarter homes, and a healthier planet. Who We Serve We work with homeowners, clean energy brands, and local installation partners to help them grow their impact, revenue, and customer reach. Our Community Impact • 1+ terawatt-hour of clean solar energy generated • 740,000+ tons of carbon emissions avoided • 90,000+ homes powered for a year Careers at Palmetto We’re a primarily remote company with team members across the U.S. and offices in Charlotte, NC and Charleston, SC. As a triple bottom line business, we’re building a better energy future—for people and the planet.
2025
Board Member
Mar 2025
The first Behavior Design Engine for the enterprise. Sequen isn’t retrofitted AI search or recommendations. It rethinks relevance from first principles. Sequen introduces the first foundational Large Event Model (LEM), trained on billions of user event sequences and built natively on a reinforcement learning infrastructure. LEMs are specialized neural networks that predict the next user event—just as LLMs predict the next word. Sequen’s LEMs are pre-trained on billions of user-site interactions and fine-tuned to optimize for the outcomes you care about. No more fixed pipelines with fragmented infrastructure. Sequen replaces them with a single endpoint that adaptively handles all phases of personalization via LEMs and memory models—all through a sub-25ms API.
2024
Investor
Jul 2024
Hippocratic AI has developed a safety-focused Large Language Model (LLM) for healthcare. The company believes that a safe LLM can dramatically improve healthcare accessibility and health outcomes in the world by bringing deep healthcare expertise to every human. No other technology has the potential to have this level of global impact on health. The company was co-founded by CEO Munjal Shah, alongside a group of physicians, hospital administrators, healthcare professionals, and artificial intelligence researchers from El Camino Health, Johns Hopkins, Stanford, Microsoft, Google, and NVIDIA. Hippocratic AI has received a total of $278 million in funding and is backed by leading investors, including Andreessen Horowitz, General Catalyst, Kleiner Perkins, NVIDIA’s NVentures, Premji Invest, SV Angel, and six health systems. For more information on Hippocratic AI, www.HippocraticAI.com. Be aware of recruitment scams impersonating Hippocratic AI. All recruiting communication will come from @hippocraticai.com email addresses. We will never request payment or sensitive personal information. If anything appears suspicious, stop engaging immediately and report the incident.
2023
Board Member
Dec 2023
Unfiltered access to what buyers are saying about you, your competitors, and your market.
Board Observer
Dec 2023
Newton, the newest member of your analytics team.
Show all 49 entries ↓
Investment activity
2008–2026 · 46 investments
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